Collar sensor



FIG. 1 is a top, front perspective view of a collar sensor, showing ournew design;

FIG. 2 is a bottom, rear perspective view thereof;

FIG. 3 is a front plan view thereof;

FIG. 4 is rear plan view thereof;

FIG. 5 is a left-side elevational view thereof;

FIG. 6 is a right-side elevational view thereof;

FIG. 7 is a top plan view thereof; and,

FIG. 8 is a bottom plan view thereof.

The broken lines depict portions of the collar sensor that form no partof the claimed design.

CLAIM The ornamental design for a collar sensor, as shown and described.